A funny thing happened bringing our new (to us) 19 home. The CO sensor went off while in a campground. I couldn't smell any gas and think it was a false alarm.

Now Cooper, the larger of our two Labradoodles, was laying on the floor near the sensor at the time. The only thing we can think of is Coopers letting of gas set of the sensor. Is this possible? Anyone else had a similar experience?

The sensor monitors carbon monoxide (odorless) but the dog would be exhaling carbon dioxide or emitting methane. Regardless, I don't think the alarm should be ignored if it should go off again. (But they sometimes are extremely sensitive.)

The sensor monitors carbon monoxide (odorless) but the dog would be exhaling carbon dioxide or emitting methane. Regardless, I don't think the alarm should be ignored if it should go off again. (But they sometimes are extremely sensitive.)

I believe in looking at my documentation that ETI installs a dual alarm that monitors both carbon monoxide AND propane. Previous threads have indicated that gaseous critters or critters who block the sensor may set it off. As mentioned earlier, continued alarms should not be ignored.

I'm likely mistaken (memory: a thing I used to have). I do remember thinking I couldn't smell anything and should have, so likely the propane sensor rather than CO. Methane/Propane, one carbon/three carbon, 6/half dozen, same thing right? But then, should have smelled something if the dog went off also? Google search of the Internet indicates our dog could be the cause, and I always believe the Internet 'cuz they have to tell the truth. But then I've been known to confuse CO and CO2, go figure.

Karen: When it went off I dug out the manual and yes it senses CO and Propane, same unit. Not sure the sounds are different but different lights come on.

Tim and Julie: Thanks for confirming it really could be the dog (if I'd doubted the Internet). And it was the dog, I swear!